Re: FPGA

On Mon, 6 Oct 1997 10:33:37 -0800, you wrote:

>>The Cinematronics CPU has 256x12 bits of SRAM with separate Din & Dout.
>>Zonn probably has the know-how to redesign the ROM interface to work
>>with only 1 ROM which would reduce the number of pins by 8, so you'd
>>need ummm 12x2 (vectors) + 6 (sound) + 15+8 (rom bus) + 24(DIP/CTRLS)
>>= about 77 IOs. If you keep the IO multiplexing off the chip (which
>>could work with the control panel FPGA), you'd need about 18 less or
>>aproximately 60 IOs. Hmmmm YUK. If you could find A/Ds with built in
>>latches, you could multiplex the XY data to get down near 50 IO. The
>>rest of the board is about 125 74xx parts.
>
>Ugggh. Boy, it's stuff like that that just kinda makes you want to make a
>functional equivalent instead. Then you get back into the debate that a
>486/33 w/ motherboard is only about $50 and if you add in an ISA or
>Parallel Port Vector Generator card like Zonn and I are doing... ;-)

My thoughts exactly. You just post faster than me.

-Zonn
Received on Mon Oct 6 10:40:50 1997